[gmx-users] add Argon to a force field?

[Amir Abbasi]

   Hi!
I want to simulate an RNA molecule.
I have the .pdb file of that.
I want to create an Argon wall and make a hole on it to pull my molecule through it.
Argon defined in OPLS/AA force field. but it has not nucleic acids.
how can i define the argon in other force fields?
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